Extension service connection



June 12, 1934. 1 SHARP EXTENSION SERVICE CONNECTION Filed May '15 2Sheets--Sheet l Nl ENTOR man 7 9 Q1 WJZA flfforn 9y: 0

June 12, 1934.

EXTENS ION SERVI CE CONNECTION Filed May 15. 1929 2 Sheets-Sheet 2 FHAINVENTOR;

L. A. SHARP 1,962,915

UNITED STATES PATENT OFFICE EXTENSION SERVICE CONNECTION L. Alan Sharp,Edgeworth, Pa., assignor to National Electric Products Corporation,Pittsburgh, Pa., a corporation of Delaware Application May 15, 1929,Serial No. 363,334 :3 Claims. (01. 247-28) 'This invention relates tonew and useful im- In describing the invention, reference is hadprovements in under floor or under partition duct to the drawings inwhich similar reference characsystems for electrical distribution andmore parters designate corresponding parts throughout ticularly to anextension service connection adaptthe several views and in which:

" ed for use in association with an under floor or Figure 1 is avertical section of the improved 0 under partition duct. extensionservice connection disclosed in en- The primary object of the inventionresides gagement with a partition duct, the various elein providing anextension service connection or ments being in assembled position, aduplex restand pipe which may be readily engaged with ceptacle beingshown in dot and dash lines applied it) or disengaged from the embeddedconduit or duct to the head for purposes of illustration.

by direct connection, providing an unobstructed Figure 2 is an outlineview of a pipe showing a wire-way and further properly supported andstop collar in the final position thereon.

locked with respect to the duct and to the par- Figure 3 is a sideelevation, partly in section tition of the structure. of an improved andornamental lock nut. Another object Of the invention resides in S0Figure 415 a, top plan view thereof 70 constructing the extensionservice connection as Figure 5 is a fragmentary top plan view of tofully protect the parts and elements enclosed the stair or partitionflange plate,

therewithin and to further withstand a reason- Figure 6 is a sideelevation, partly in section, able amount of abuse in connection withits exof Figure 5, posed position. Figure '7 is a vertical section,showing a modified 75 Still another object resides in providing a standfo m of the flange locking me ns. p p Which is y d d and directly Figure8 is a side elevation, partly in section, connected to the duct belowthe 1 line and of the ornamental lock nut used in connection providingornamental and useful means in conith th difi d fo m a h wn i Figure 7nection therewith to lock the stand pipe with Figure 9 is a top planview of Figure 8. 80 respect to the floor and simultaneously obscureFigure 10 i id 1 ti n, partly in se tion, the threads of the stand pipeprojecting above of th urface floor flange plate, said floor line.Figure 11 is a top plan view thereof.

Still another object of the invention resides in In t ion e i econnections t present in providing an extension service connection which,11 d stand-pipes are connected to the 5 has perfectgroundingConnection, 0 adapters, duct through the medium of one or more adaptppthimbles inselts being used to connect ers by inserts, thimbles, or byexpansible fittings the duet w th the Stand p p which are attached tothe stand-pipe. It is ob- Still anoth r obj t resides in providing avious that, in order to obtain a good electrical ice connection With aminimum Of separable 918C- ground connection and a, trong mechanicalcontr cal grounding fi struction the number of parts uniting a stand-Another object of the invention is to provide an pipe t d t h l b d d ti i extension service connection in which the move- In the inventionherewith d i interment of th S -p p With the duct may be Suitmediatefastening means between the duct and 40 ably limited. the stand-pipesare used, thereby eliminating Still another object resides in providingan grounding t 1 extension service connection with a nut adapted Indescribing the invention, reference is had to conceal h plate adjustingmeans. to the drawings in which similar reference char- A still furtherObj ct resides in providing a acters designate corresponding partsthroughout 45 device W ieh s comparatively Simple and durable theseveral views and in which 1 designates a i C n t u ineXpensiVe tomanufacture cement floor of a structure below the upper line which canbe easily handled and installed and of which is embedded the duct 2,which is proone which will be very efficient and useful in vided underthe floor or in the partition in the operation. construction of thebuilding. The term partition 50 With these and numerous other objects inis used in its broad sense and it is intended to View, the inventionconsists in the novel features cover outside building walls, interiorpartitions, of construction, combination and arrangement of floorpartitions and, in fact, any portion of a parts as will be hereinafterreferred to and more building construction which separates one spaceparticularly pointed out in the specification and in the building fromanother. The duct at reg- 55 claims. ular intervals throughout itslength is provided CAD on the upper wall thereof with integral,upstanding and internally threaded bosses 3 which, ordinarily, are of aheight less than the distance to the floor line of the structure. Theimproved extension service connection is adapted for engagement with theaforesaid bosses, as will appear in detail herebelow.

The improved extension service connection comprises a stand-pipe 4 whichfrom its lower edge is externally threaded for a good portion of itslength, as shown at 5 and also externally threaded at its upper end asshown at 6. The lower threaded end of the stand-pipe is adapted toengage the internally threaded and upstanding boss 3, as clearly shownin Figures 1 and 7 of the drawings and soldered or otherwise fastened ata predetermined distance from the lower end of the stand-pipe,externally thereof is a stop collar 7 which is adapted to engage theupper peripheral edge of the boss 3 and limit the move- -ment of thestand-pipe 4 with respect to the duct 2 and lock the stand-pipesubstantially with re- 'spect to said duct, as appears obvious.

An opening 8 of course is provided in the floor 1 through which thestand-pipe 4 projects and into which the boss 3 projects. Prior to theintroduction of the stand-pipe into this opening 8, any desired orpreferred covering may be provided therefor. It will be seen however,that the threaded portion of the stand-pipe 4 from the lower end thereofprojects above the floor line.

Threaded onto the portion 5 of the stand-pipe is a flange plate 9 whichis adapted to engage the floor line when the device is assembled andapplied to use and obviously the same retains the stand-pipe securely tothe floor when projecting thereabove. In order to lock the flange plate9 -in position and also to provide means for covering the projectingthreads 5 on the standpipe,

an ornamental lock nut 10 is provided which is internally threaded andengaged with the threads 5, as appears clearly in Figure 1 of thedrawings.

As indicated, this look nut is ornamentally designed to give the mostpleasing effect, at the same time locking the base flange in positionand covering the threads of the stand-pipe.

Engaged with the upper threaded end 6 at the stand-pipe 4 is a servicehead which may be of any desired construction, for holding an electricreceptacle.

It may be here stated that the flange plate 9 applied to the stand-pipe4 is provided adjacent its threaded opening with openings 11 whichpermit a spanner wrench or the like to be engaged therewith for turninghome said flange. The lower end of the lock nut 10, as seen in Figures 3and 4 particularly is slightly enlarged so that when said nut is turnedhome on the stand-pipe against the flange plate, the openings 11 will becovered thereby, thus presenting a neat appearing connection and at thesame time preventing dust and dirt from collecting in said openings.

In Figures 7 to 11 inclusive there is shown a slightly modified form ofthe invention. In this case, the plate flange 12 is provided with aplurality of flat surfaces 13 to which a wrench may be applied forraising or lowering said plate flange, and the ornamental nut 14 has arecess 15 at its lower end 16 by means of which the flat surfaces 13 maybe concealed.

As in the preferred form, the nut 14 not only serves as a means oflocking the flange plate 12, but also hides or conceals the unusedthreads of the pipe 4, and the polygonal wrench gripping faces of theflange plate 12. 7

From the foregoing description of the construction of these improveddevices the operation thereof and the manner of applying the same to usewill be readily understood and it will be seen that there is provided asimple, inexpensive and eflicient means for carrying out the manyobjects of the invention.

While there is particularly described the elements best adapted toperform the functions set forth, it is obvious that various changes inform, proportion and in the minor details of construction may beresorted to, without departing from the spirit or sacrificing any of theprinciples of the invention.

What is claimed is:

1. In an under floor duct system the combination with a duct having aninternally threaded and upstanding boss formed thereon; of a serviceextension connection including a stand-pipe externally threaded from itslower end for a goodly portion of its length, the lower end of saidstandpipe being engaged with said boss, means for limiting the movementof the stand-pipe with respect to said boss, a flange engaged with thethreads of said stand-pipe and adapted to contact with the floor line, alock nut engaged with the threaded portion of said stand-pipe to securethe flange in contact with the partition surface and simultaneouslyobscure the threads on the stand-pipe from view.

2. In a concealed duct system the combination with a duct having anopening therein, of a one piece service extension connection in directengagement with said duct opening; a building partition enclosing theduct; a flange adapted to be adjusted on said service extension toexternally' engage the partition surface and a nut positioned on theservice extension and provided with means to conceal the said flange.

3. In a concealed duct system the combination with a duct having anopening therein, of a one adjusting means of piece service extensionconnection in direct engagement with said duct opening; a buildingpartition enclosing the duct; a flange adapted to be adjusted on saidservice extension to externally engage the partition surface; a nut onsaid

